<template>
  <div id="aCoursesList" class="bg-fa of">
    <!-- /课程列表 开始 -->
    <section class="container">
      <header class="comm-title">
        <h2 class="fl tac">
          <span class="c-333">全部课程</span>
        </h2>
      </header>
      <section class="c-sort-box">
        <section class="c-s-dl">
          <dl>
            <dt>
              <span class="c-999 fsize14">课程类别</span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li>
                  <a title="全部" href="#">全部</a>
                </li>
                <li
                  v-for="(one,index) in subjectNestedList"
                  :key="index"
                  @click="searchOne(one.id,index)"
                  :class="{active:oneIndex==index}"
                >
                  <a :title="one.title" href="#">{{one.title}}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <dl>
            <dt>
              <span class="c-999 fsize14"></span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li
                  v-for="(two,index) in subSubjectList"
                  :key="index"
                  @click="searchTwo(two.id,index)"
                  :class="{active:twoIndex==index}"
                >
                  <a :title="two.title" href="#">{{two.title}}</a>
                </li> 
              </ul>
            </dd>
          </dl>
          <div class="clear"></div>
        </section>
        <div class="js-wrap">
          <section class="fr">
            <span class="c-ccc">
              <i class="c-master f-fM">1</i>/
              <i class="c-666 f-fM">1</i>
            </span>
          </section>
          <section class="fl">
            <ol class="js-tap clearfix">
              <li :class="{'current bg-orange':buyCountSort!=''}">
                <a title="销量" href="javascript:void(0);" @click="searchBuyCount()">
                  销量
                  <span :class="{hide:buyCountSort==''}">↓</span>
                </a>
              </li>
              <li :class="{'current bg-orange':gmtCreateSort!=''}">
                <a title="最新" href="javascript:void(0);" @click="searchGmtCreate()">
                  最新
                  <span :class="{hide:gmtCreateSort==''}">↓</span>
                </a>
              </li>
              <li :class="{'current bg-orange':priceSort!=''}">
                <a title="价格" href="javascript:void(0);" @click="searchPrice()">
                  价格&nbsp;
                  <span :class="{hide:priceSort==''}">↓</span>
                </a>
              </li>
            </ol>
          </section>
        </div>
        <div class="mt40">
          <!-- /无数据提示 开始-->
          <section class="no-data-wrap" v-if="data.total == 0">
            <em class="icon30 no-data-ico">&nbsp;</em>
            <span class="c-666 fsize14 ml10 vam">没有相关数据，小编正在努力整理中...</span>
          </section>
          <!-- /无数据提示 结束-->
          <article class="comm-course-list" v-if="data.total > 0">
            <ul class="of" id="bna">
              <li v-for="item in data.items" :key="item.id">
                <div class="cc-l-wrap">
                  <section class="course-img">
                    <img :src="item.cover" class="img-responsive" :alt="item.title" />
                    <div class="cc-mask">
                      <a :href="'/course/'+item.id" title="开始学习" class="comm-btn c-btn-1">开始学习</a>
                    </div>
                  </section>
                  <h3 class="hLh30 txtOf mt10">
                    <a
                      :href="'/course/'+item.id"
                      :title="item.title"
                      class="course-title fsize18 c-333"
                    >{{item.title}}</a>
                  </h3>
                  <section class="mt10 hLh20 of">
                    <span class="fr jgTag bg-green" v-if="Number(item.price) == 0">
                      <!-- <i class="c-fff fsize12 f-fA">{{ item.price == 0 ? '免费' : '￥'+item.price}}</i> -->
                      <i class="c-fff fsize12 f-fA">免费</i>
                    </span>
                    <span class="fl jgAttr c-ccc f-fA">
                      <i class="c-999 f-fA">{{item.buyCount}}人学习</i>
                      |
                      <i class="c-999 f-fA">{{item.viewCount}}浏览</i>
                    </span>
                  </section>
                </div>
              </li>
            </ul>
            <div class="clear"></div>
          </article>
        </div>
        <!-- 公共分页 开始 -->
        <div>
          <div class="paging">
            <!-- undisable这个class是否存在，取决于数据属性hasPrevious -->
            <a
              :class="{undisable: !data.hasPrevious}"
              href="#"
              title="首页"
              @click.prevent="gotoPage(1)"
            >首</a>
            <a
              :class="{undisable: !data.hasPrevious}"
              href="#"
              title="前一页"
              @click.prevent="gotoPage(data.current-1)"
            >&lt;</a>
            <a
              v-for="page in data.pages"
              :key="page"
              :class="{current: data.current == page, undisable: data.current == page}"
              :title="'第'+page+'页'"
              href="#"
              @click.prevent="gotoPage(page)"
            >{{ page }}</a>
            <a
              :class="{undisable: !data.hasNext}"
              href="#"
              title="后一页"
              @click.prevent="gotoPage(data.current+1)"
            >&gt;</a>
            <a
              :class="{undisable: !data.hasNext}"
              href="#"
              title="末页"
              @click.prevent="gotoPage(data.pages)"
            >末</a>
            <div class="clear" />
          </div>
        </div>
        <!-- 公共分页 结束 -->
      </section>
    </section>
    <!-- /课程列表 结束 -->
  </div>
</template>
<script>
import CourseApi from "@/api/course";
export default {
  data() {
    return {
      page: 1,
      data: {}, //课程分页数据
      subjectNestedList: [], // 一级分类列表
      subSubjectList: [], // 二级分类列表
      searchObj: {}, // 查询表单对象
      oneIndex: -1,
      twoIndex: -1,
      buyCountSort: "",
      gmtCreateSort: "",
      priceSort: ""
    };
  },
  created() {
    //初始化课程列表
    this.getCourseList();
    this.getSubjectList();
  },
  methods: {
    //初始化课程列表
    getCourseList() {
      CourseApi.getCourseList(1, 8, this.searchObj).then(res => {
        this.data = res.data.data;
      });
    },
    //获取分类列表
    getSubjectList() {
      CourseApi.getSubjectList().then(res => {
        this.subjectNestedList = res.data.data.list;
      });
    },
    //分页
    gotoPage(page) {
      CourseApi.getCourseList(page, 8, this.searchObj).then(res => {
        this.data = res.data.data;
      });
    },
    //查询一级分类下的二级分类
    searchOne(subjectParentId, index) {
      //设置选择的一级分类背景色
      this.oneIndex = index;
      //取消二级分类背景色
      this.twoIndex = -1;
      //清空二级分类的信息
      this.subSubjectList = [];
      //清空查询条件的二级分类信息
      this.searchObj.subjectId = "";
      //将一级分类赋值到查询条件中
      this.searchObj.subjectParentId = subjectParentId;
      //选中一级分类，查询该一级分类下的课程
      this.gotoPage(1);
      //遍历判断选中的一级分类，获取选择的一级分类下的二级分类
      for (let i = 0; i < this.subjectNestedList.length; i++) {
        if (subjectParentId == this.subjectNestedList[i].id) {
          this.subSubjectList = this.subjectNestedList[i].children;
        }
      }
    },
    //查询二级分类
    searchTwo(subjectId, index) {
      //样式展示
      this.twoIndex = index;
      //给查询条件赋值
      this.searchObj.subjectId = subjectId;
      //查询
      this.gotoPage(1);
    },
    //根据销量
    searchBuyCount() {
      //设置销量有值，其他值清空
      this.buyCountSort = 1;
      this.gmtCreateSort = "";
      this.priceSort = "";
      //给查询条件赋值
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      this.gotoPage(1);
    },
    //根据最新
    searchGmtCreate() {
      this.buyCountSort = "";
      this.gmtCreateSort = 1;
      this.priceSort = "";
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      this.gotoPage(1);
    },
    //根据价格
    searchPrice() {
      this.buyCountSort = "";
      this.gmtCreateSort = "";
      this.priceSort = 1;
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      this.gotoPage(1);
    }
  }
};
</script>
<style scoped>
.active {
  background: #bdbdbd;
}
.hide {
  display: none;
}
.show {
  display: block;
}
</style>